@article {MR2784490,
	title = {The complexity of central series in nilpotent computable groups},
	journal = {Ann. Pure Appl. Logic},
	volume = {162},
	number = {8},
	year = {2011},
	pages = {667{\textendash}678},
	issn = {0168-0072},
	doi = {10.1016/j.apal.2011.01.011},
	url = {https://doi.org/10.1016/j.apal.2011.01.011},
	author = {Csima, Barbara F. and Solomon, Reed}
}
